[AsmPrinter] De-capitalize some AsmPrinter::Emit* functions

Similar to rL328848.
diff --git a/llvm/docs/GarbageCollection.rst b/llvm/docs/GarbageCollection.rst
index 5e671bc..8c6b046 100644
--- a/llvm/docs/GarbageCollection.rst
+++ b/llvm/docs/GarbageCollection.rst
@@ -970,7 +970,7 @@
         // Emit the address of the safe point.
         OS.AddComment("safe point address");
         MCSymbol *Label = PI->Label;
-        AP.EmitLabelPlusOffset(Label/*Hi*/, 0/*Offset*/, 4/*Size*/);
+        AP.emitLabelPlusOffset(Label/*Hi*/, 0/*Offset*/, 4/*Size*/);
       }
 
       // Stack information never change in safe points! Only print info from the