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Pull in r222562 from upstream llvm trunk (by Roman Divacky):
Disable header duplication at -Oz in loop-rotate pass.
This helps to minimize the size of boot2.
Introduced here: http://svnweb.freebsd.org/changeset/base/274968
Index: lib/Transforms/IPO/PassManagerBuilder.cpp
===================================================================
--- lib/Transforms/IPO/PassManagerBuilder.cpp
+++ lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -195,7 +195,8 @@ void PassManagerBuilder::populateModulePassManager
MPM.add(createTailCallEliminationPass()); // Eliminate tail calls
MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
MPM.add(createReassociatePass()); // Reassociate expressions
- MPM.add(createLoopRotatePass()); // Rotate Loop
+ // Rotate Loop - disable header duplication at -Oz
+ MPM.add(createLoopRotatePass(SizeLevel == 2 ? 0 : -1));
MPM.add(createLICMPass()); // Hoist loop invariants
MPM.add(createLoopUnswitchPass(SizeLevel || OptLevel < 3));
MPM.add(createInstructionCombiningPass());
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