MC/Mach-O: Mark absolute variable's appropriately, and add Mach-O support for
writing them.
 - <rdar://problem/7885351> integrated assembler broken for i386 objc code

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103112 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCSymbol.cpp b/lib/MC/MCSymbol.cpp
index 82d72a3..07751f7 100644
--- a/lib/MC/MCSymbol.cpp
+++ b/lib/MC/MCSymbol.cpp
@@ -44,6 +44,10 @@
   assert((isUndefined() || (isAbsolute() && isa<MCConstantExpr>(Value))) &&
          "Invalid redefinition!");
   this->Value = Value;
+
+  // Mark the variable as absolute as appropriate.
+  if (isa<MCConstantExpr>(Value))
+    setAbsolute();
 }
 
 void MCSymbol::print(raw_ostream &OS) const {