[llvm] [XCOFF][obj2yaml] Support SymbolAlignmentAndType as 2 separate fields in YAML. (PR #76828)

[via llvm-commits]

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@@ -525,11 +526,19 @@ bool XCOFFWriter::writeRelocations() {
 }
 
 void XCOFFWriter::writeAuxSymbol(const XCOFFYAML::CsectAuxEnt &AuxSym) {
+  uint8_t SymAlignAndType = AuxSym.SymbolAlignmentAndType.value_or(0);
+  if (AuxSym.SymbolType)
+    SymAlignAndType = (SymAlignAndType & ~XCOFFCsectAuxRef::SymbolTypeMask) |
+                      *AuxSym.SymbolType;
+  if (AuxSym.SymbolAlignment)
+    SymAlignAndType =
+        (SymAlignAndType & ~XCOFFCsectAuxRef::SymbolAlignmentMask) |
+        (*AuxSym.SymbolAlignment << XCOFFCsectAuxRef::SymbolAlignmentBitOffset);
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diggerlin wrote:

if both forms in a YAML file, in the source code "SymbolType/SymbolAlignment" will override SymbolAlignment, but the user may not know the rule, I have same opinion as Jame to emit  an error to specify both forms.

if it is difficult to emit error/warning, I am prefer support  "SymbolType/SymbolAlignment" not support SymbolAlignment.
since you only output SymbolType/SymbolAlignment in the xcoff2yaml.


https://github.com/llvm/llvm-project/pull/76828