[XCOFF][AIX] Emit TOC entries for object file generation

Summary:
Implement emitTCEntry for PPCTargetXCOFFStreamer.
Add TC csects to TOCCsects for object file writing.

Note:

1. I did not include any raw data testing for this object file generation
because TC entries raw data will all be 0 without relocation implemented.
I will add raw data testing as part of relocation testing later.
2. I removed "Symbol->setFragment(F);" for common symbols because we
 don't need it, and if we have it then we would hit assertions below:
Assertion `(SymbolContents == SymContentsUnset ||
            SymbolContents == SymContentsOffset) &&
            "Cannot get offset for a common/variable symbol"' failed.
3.Fixed incorrect TOC-base alignment.

Differential Revision: https://reviews.llvm.org/D70798

1 files changed, 0 insertions, 6 deletions

diff --git a/llvm/lib/MC/MCXCOFFStreamer.cpp b/llvm/lib/MC/MCXCOFFStreamer.cpp
index c40a067e93e..6efa167ced4 100644
--- a/llvm/lib/MC/MCXCOFFStreamer.cpp
+++ b/llvm/lib/MC/MCXCOFFStreamer.cpp
@@ -50,12 +50,6 @@ void MCXCOFFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
                       XCOFF::C_HIDEXT);
   Symbol->setCommon(Size, ByteAlignment);
 
-  // Need to add this symbol to the current Fragment which will belong to the
-  // containing CSECT.
-  auto *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
-  assert(F && "Expected a valid section with a fragment set.");
-  Symbol->setFragment(F);
-
   // Emit the alignment and storage for the variable to the section.
   EmitValueToAlignment(ByteAlignment);
   EmitZeros(Size);