[clang] [ClangIR] Support bool-returning await_suspend (PR #227527)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-aarch64-windows` running on `linaro-armv8-windows-msvc-05` while building `clang` at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/141/builds/24180

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test) failure: build (failure)
...
PASS: lldb-shell :: SymbolFile/NativePDB/structured-bindings-clang.test (2271 of 2710)
PASS: lldb-shell :: SymbolFile/NativePDB/structured-bindings-msvc.test (2272 of 2710)
PASS: lldb-shell :: SymbolFile/NativePDB/symtab.cpp (2273 of 2710)
PASS: lldb-shell :: SymbolFile/NativePDB/tag-types.cpp (2274 of 2710)
PASS: lldb-shell :: SymbolFile/NativePDB/thread-locals.cpp (2275 of 2710)
PASS: lldb-shell :: SymbolFile/NativePDB/type-quals.test (2276 of 2710)
PASS: lldb-shell :: SymbolFile/NativePDB/typedefs.cpp (2277 of 2710)
PASS: lldb-shell :: SymbolFile/NativePDB/typedefs.test (2278 of 2710)
PASS: lldb-shell :: SymbolFile/NativePDB/udt-layout.test (2279 of 2710)
UNSUPPORTED: lldb-shell :: SymbolFile/NativePDB/unknown-udt-decl.ll (2280 of 2710)
FAIL: lldb-shell :: SymbolFile/NativePDB/stack_unwinding01.cpp (2281 of 2710)
******************** TEST 'lldb-shell :: SymbolFile/NativePDB/stack_unwinding01.cpp' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 4
'C:\Users\tcwg\scoop\apps\python\current\python.exe' C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\Shell\helper\build.py --compiler=any --arch=64 --tools-dir=C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin --libs-dir=C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./lib --compiler=clang-cl --nodefaultlib -o C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\tools\lldb\test\Shell\SymbolFile\NativePDB\Output\stack_unwinding01.cpp.tmp.exe -- C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\Shell\SymbolFile\NativePDB\stack_unwinding01.cpp
# executed command: 'C:\Users\tcwg\scoop\apps\python\current\python.exe' 'C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\Shell\helper\build.py' --compiler=any --arch=64 --tools-dir=C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin --libs-dir=C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./lib --compiler=clang-cl --nodefaultlib -o 'C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\tools\lldb\test\Shell\SymbolFile\NativePDB\Output\stack_unwinding01.cpp.tmp.exe' -- 'C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\Shell\SymbolFile\NativePDB\stack_unwinding01.cpp'
# .---command stdout------------
# | Cleaning stack_unwinding01.ilk
# | Cleaning stack_unwinding01.cpp.tmp.exe-stack_unwinding01.obj
# | Cleaning stack_unwinding01.cpp.tmp.pdb
# | Cleaning stack_unwinding01.cpp.tmp.exe
# | 
# | 
# | 
# | compiling stack_unwinding01.cpp -> stack_unwinding01.cpp.tmp.exe-stack_unwinding01.obj
# |   STDOUT:
# | 
# | 
# | 
# | 
# | linking stack_unwinding01.cpp.tmp.exe-stack_unwinding01.obj -> stack_unwinding01.cpp.tmp.exe
# |   STDOUT:
# | 
# `-----------------------------
# RUN: at line 5
c:\users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\lldb.exe --no-lldbinit -S C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/tools/lldb\test\Shell\lit-lldb-init-quiet -f C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\tools\lldb\test\Shell\SymbolFile\NativePDB\Output\stack_unwinding01.cpp.tmp.exe -s      C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\Shell\SymbolFile\NativePDB/Inputs/stack_unwinding01.lldbinit 2>&1 | c:\users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\filecheck.exe C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\Shell\SymbolFile\NativePDB\stack_unwinding01.cpp
# executed command: 'c:\users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\lldb.exe' --no-lldbinit -S 'C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/tools/lldb\test\Shell\lit-lldb-init-quiet' -f 'C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\tools\lldb\test\Shell\SymbolFile\NativePDB\Output\stack_unwinding01.cpp.tmp.exe' -s 'C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\Shell\SymbolFile\NativePDB/Inputs/stack_unwinding01.lldbinit'
# note: command had no output on stdout or stderr
# executed command: 'c:\users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\filecheck.exe' 'C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\Shell\SymbolFile\NativePDB\stack_unwinding01.cpp'
# .---command stderr------------
# | C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\Shell\SymbolFile\NativePDB\stack_unwinding01.cpp:38:16: error: CHECK-NEXT: expected string not found in input
# | // CHECK-NEXT: * thread #1, stop reason = breakpoint 1.1
# |                ^
# | <stdin>:57:24: note: scanning from here
# | (lldb) thread backtrace
# |                        ^

```

</details>

https://github.com/llvm/llvm-project/pull/227527