[clang] [clang-c] introduce queries on GCC-style inline assembly statements (PR #143424)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

Precommit CI found a relevant failure on Windows (it looks like we're crashing, IIRC that's `STATUS_HEAP_CORRUPTION` as a failure code):
```
 FAIL: Clang :: Index/inline-assembly.c (13090 of 21590)
******************** TEST 'Clang :: Index/inline-assembly.c' FAILED ********************
Exit Code: 2

Command Output (stdout):
--
# RUN: at line 13
c:\_work\llvm-project\llvm-project\build\bin\c-index-test.exe -test-inline-assembly C:\_work\llvm-project\llvm-project\clang\test\Index\inline-assembly.c 2>&1 | c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe C:\_work\llvm-project\llvm-project\clang\test\Index\inline-assembly.c
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\c-index-test.exe' -test-inline-assembly 'C:\_work\llvm-project\llvm-project\clang\test\Index\inline-assembly.c'
# note: command had no output on stdout or stderr
# error: command failed with exit status: 0xc0000374
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe' 'C:\_work\llvm-project\llvm-project\clang\test\Index\inline-assembly.c'
# .---command stderr------------
# | FileCheck error: '<stdin>' is empty.
# | FileCheck command line:  c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe C:\_work\llvm-project\llvm-project\clang\test\Index\inline-assembly.c
# `-----------------------------
# error: command failed with exit status: 2

--

********************
```

https://github.com/llvm/llvm-project/pull/143424