Fix build failure due to race between two PRs.

The first of the following commits did some renames that result in the
second to fail, but they were both in CI being tested simultaneously,
passed, and were merged.

12a774a
93af58d

Author: rudkx

lib/IRGen/GenMeta.cpp

@@ -3233,7 +3233,7 @@ namespace {
 
         // Otherwise, we know the offset at compile time, even if our
         // clients do not, so just emit a constant.
-        auto &layout = IGM.getMetadataLayout(theClass);
+        auto &layout = IGM.getClassMetadataLayout(theClass);
 
         auto value = layout.getStartOfImmediateMembers();
         auto *init = llvm::ConstantInt::get(IGM.SizeTy, value.getValue());