[CoroSplit] Keep coro.free for resume/destroy functions

[NewSigma]

Part 1/4: Implement HALO for coroutines that flow off final suspend. Parent PR approved in #185336, with no change since then

Previously, we unconditionally lowered coro.free. Now, we lower it only for the cleanup function. The remaining coro.free intrinsics will be lowered in CoroCleanup. Keep these coro.free so that we can elide them.

[llvm-ci]

LLVM Buildbot has detected a new failure on builder openmp-offload-amdgpu-runtime-2 running on rocm-worker-hw-02 while building llvm at step 10 "Add check check-libc-amdgcn-amd-amdhsa".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/10/builds/24477

Here is the relevant piece of the build log for the reference

Step 10 (Add check check-libc-amdgcn-amd-amdhsa) failure: test (failure)
...
[       OK ] LlvmLibcFMaximumMagTest.InfArg (4 us)
[ RUN      ] LlvmLibcFMaximumMagTest.NegInfArg
[       OK ] LlvmLibcFMaximumMagTest.NegInfArg (4 us)
[ RUN      ] LlvmLibcFMaximumMagTest.BothZero
[       OK ] LlvmLibcFMaximumMagTest.BothZero (3 us)
[ RUN      ] LlvmLibcFMaximumMagTest.Range
[       OK ] LlvmLibcFMaximumMagTest.Range (11 ms)
Ran 5 tests.  PASS: 5  FAIL: 0
[2574/3340] Linking CXX executable libc/test/src/math/smoke/libc.test.src.math.smoke.ffma_test.__hermetic__.__build__
[2575/3340] Running hermetic test libc.test.src.math.smoke.roundf16_test.__hermetic__
FAILED: libc/test/src/math/smoke/libc.test.src.math.smoke.roundf16_test.__hermetic__.__cmd__ /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/runtimes/runtimes-amdgcn-amd-amdhsa-bins/libc/test/src/math/smoke/libc.test.src.math.smoke.roundf16_test.__hermetic__.__cmd__ 
cd /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/runtimes/runtimes-amdgcn-amd-amdhsa-bins/libc/test/src/math/smoke && /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/bin/llvm-gpu-loader /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/runtimes/runtimes-amdgcn-amd-amdhsa-bins/libc/test/src/math/smoke/libc.test.src.math.smoke.roundf16_test.__hermetic__.__build__
[==========] Running 3 tests from 1 test suite.
[ RUN      ] LlvmLibcRoundTest.SpecialNumbers
[       OK ] LlvmLibcRoundTest.SpecialNumbers (4 us)
[ RUN      ] LlvmLibcRoundTest.RoundedNubmers
[       OK ] LlvmLibcRoundTest.RoundedNubmers (2 us)
[ RUN      ] LlvmLibcRoundTest.Fractions
[       OK ] LlvmLibcRoundTest.Fractions (7 us)
Ran 3 tests.  PASS: 3  FAIL: 0
[2576/3340] Running hermetic test libc.test.src.math.logbl_test.__hermetic__
[==========] Running 4 tests from 1 test suite.
[ RUN      ] LlvmLibcLogbTest.SpecialNumbers
[       OK ] LlvmLibcLogbTest.SpecialNumbers (5 us)
[ RUN      ] LlvmLibcLogbTest.PowersOfTwo
[       OK ] LlvmLibcLogbTest.PowersOfTwo (4 us)
[ RUN      ] LlvmLibcLogbTest.SomeIntegers
[       OK ] LlvmLibcLogbTest.SomeIntegers (4 us)
[ RUN      ] LlvmLibcLogbTest.InRange
[       OK ] LlvmLibcLogbTest.InRange (16 ms)
Ran 4 tests.  PASS: 4  FAIL: 0
[2577/3340] Running hermetic test libc.test.src.math.ilogbf_test.__hermetic__
[==========] Running 5 tests from 1 test suite.
[ RUN      ] LlvmLibcILogbTest.SpecialNumbers_ilogbf
[       OK ] LlvmLibcILogbTest.SpecialNumbers_ilogbf (2 us)
[ RUN      ] LlvmLibcILogbTest.PowersOfTwo_ilogbf
[       OK ] LlvmLibcILogbTest.PowersOfTwo_ilogbf (0 ns)
[ RUN      ] LlvmLibcILogbTest.SomeIntegers_ilogbf
[       OK ] LlvmLibcILogbTest.SomeIntegers_ilogbf (0 ns)
[ RUN      ] LlvmLibcILogbTest.SubnormalRange_ilogbf
[       OK ] LlvmLibcILogbTest.SubnormalRange_ilogbf (745 us)
[ RUN      ] LlvmLibcILogbTest.NormalRange_ilogbf
[       OK ] LlvmLibcILogbTest.NormalRange_ilogbf (1 ms)
Ran 5 tests.  PASS: 5  FAIL: 0
[2578/3340] Linking CXX executable libc/test/src/math/smoke/libc.test.src.math.smoke.fsqrt_test.__hermetic__.__build__
[2579/3340] Linking CXX executable libc/test/src/math/smoke/libc.test.src.math.smoke.ffmal_test.__hermetic__.__build__
[2580/3340] Linking CXX executable libc/test/src/math/smoke/libc.test.src.math.smoke.dsqrtl_test.__hermetic__.__build__
[2581/3340] Running hermetic test libc.test.src.math.smoke.fmaximum_numbf16_test.__hermetic__
[==========] Running 5 tests from 1 test suite.