[llvm] [X86][WinEH] Insert nop after unwinding inline assembly (PR #176393)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Windows-->
# :window: Windows x64 Test Results

* 129547 tests passed
* 2866 tests skipped
* 1 test failed

## Failed Tests
(click on a test name to see its output)

### LLVM
<details>
<summary>LLVM.CodeGen/AArch64/GlobalISel/irtranslator-unwind-inline-asm.ll</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
c:\_work\llvm-project\llvm-project\build\bin\llc.exe -O0 -global-isel -stop-after=irtranslator < C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\AArch64\GlobalISel\irtranslator-unwind-inline-asm.ll | c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\AArch64\GlobalISel\irtranslator-unwind-inline-asm.ll
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\llc.exe' -O0 -global-isel -stop-after=irtranslator
# note: command had no output on stdout or stderr
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe' 'C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\AArch64\GlobalISel\irtranslator-unwind-inline-asm.ll'
# .---command stderr------------
# | C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\AArch64\GlobalISel\irtranslator-unwind-inline-asm.ll:24:16: error: CHECK-NEXT: expected string not found in input
# |  ; CHECK-NEXT: INLINEASM &"bl trap", 1 /* sideeffect attdialect */
# |                ^
# | <stdin>:174:22: note: scanning from here
# |  EH_LABEL <mcsymbol >
# |                      ^
# | <stdin>:175:2: note: possible intended match here
# |  INLINEASM &"bl trap", 65 /* sideeffect attdialect */
# |  ^
# | 
# | Input file: <stdin>
# | Check file: C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\AArch64\GlobalISel\irtranslator-unwind-inline-asm.ll
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |            .
# |            .
# |            .
# |          169:  bb.1.entry: 
# |          170:  successors: %bb.2(0x40000000), %bb.3(0x40000000) 
# |          171:   
# |          172:  %4:_(p0) = G_GLOBAL_VALUE @.str.2 
# |          173:  G_INVOKE_REGION_START 
# |          174:  EH_LABEL <mcsymbol > 
# | next:24'0                          X error: no match found
# |          175:  INLINEASM &"bl trap", 65 /* sideeffect attdialect */ 
# | next:24'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | next:24'1      ?                                                     possible intended match
# |          176:  EH_LABEL <mcsymbol > 
# | next:24'0     ~~~~~~~~~~~~~~~~~~~~~~
# |          177:  G_BR %bb.2 
# | next:24'0     ~~~~~~~~~~~~
# |          178:   
# | next:24'0     ~~
# |          179:  bb.2.invoke.cont: 
# | next:24'0     ~~~~~~~~~~~~~~~~~~~
# |          180:  RET_ReallyLR 
# | next:24'0     ~~~~~~~~~~~~~~
# |            .
# |            .
# |            .
# | >>>>>>
# `-----------------------------
# error: command failed with exit status: 1

--

```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/176393