[WebAssembly] Fix incorrect DW_TAG_pointer_type size in test

[arichardson]

Summary

It should be 64 bits not 32 for wasm64-unknown-unknown. I noticed this
because this test was failing in our CHERI fork of LLVM due to a larger
.debug_abbrev section size. It turns out this happens because we add
DW_AT_byte_size for non-default pointer sizes to allow debugging our
hybrid compilation mode where we can have two different kinds of pointers.

[aardappel]

Thanks, that would make sense, since this test was probably adapted from the 32-bit version.

It doesn't seem to affect anything in the test output though, which is unfortunate?

[arichardson]

If you apply https://reviews.llvm.org/D99411, the current test will fail due to additional bytes in debug_abbrev.

[arichardson]

In D99410#2653456, @arichardson wrote:

If you apply https://reviews.llvm.org/D99411, the current test will fail due to additional bytes in debug_abbrev.

I see now that phabricator has tested that revision and even shows it as failing.

llvm/test/MC/WebAssembly/debug-info64.ll

 !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
 !1 = distinct !DIGlobalVariable(name: "foo", scope: !2, file: !3, line: 4, type: !11, isLocal: false, isDefinition: true)
 !2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 7.0.0 (trunk 332303) (llvm/trunk 332406)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
 !3 = !DIFile(filename: "test.c", directory: "/usr/local/google/home/sbc/dev/wasm/simple")
 !4 = !{}
 !5 = !{!0, !6}
 !6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
 !7 = distinct !DIGlobalVariable(name: "ptr2", scope: !2, file: !3, line: 5, type: !8, isLocal: false, isDefinition: true)
-!8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 32)
+!8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 64)
 !9 = !DISubroutineType(types: !10)
 !10 = !{null}
-!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 32)
+!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
 !12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
 !13 = !{i32 2, !"Dwarf Version", i32 4}
 !14 = !{i32 2, !"Debug Info Version", i32 3}
 !15 = !{i32 1, !"wchar_size", i32 4}
 !16 = !{!"clang version 7.0.0 (trunk 332303) (llvm/trunk 332406)"}
 !17 = distinct !DISubprogram(name: "f2", scope: !3, file: !3, line: 2, type: !9, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !2, retainedNodes: !4)
 !18 = !DILocation(line: 2, column: 17, scope: !17)