This fixes the issue noted in PR10251 where early tail dup of bbs with
indirectbr would cause a bb to be duplicated into a loop preheader
and then into its predecessors, creating phi nodes with identical
operands just before register allocation.

This helps with jsinterp.o size (__TEXT goes from 163568 to 126656)
and a bit with performance 1.005x faster on sunspider (jits still enabled).

The result on webkit with the jit disabled is more significant: 1.021x faster.

llvm-svn: 134372

HasIndirectbr variable to be just that. No functionality change.

llvm-svn: 134371

llvm-svn: 134370

A split point inserted in a block with a landing pad successor may be
hoisted above the call to ensure that it dominates all successors. The
code that handles the rest of the basic block must take this into
account.

I am not including a test case, it would be very fragile. PR10244 comes
from building clang with exceptions enabled.

llvm-svn: 134369

This is what both the ABI and clang says.

llvm-svn: 134367

llvm-svn: 134366

llvm-svn: 134364

makes one of the tests actually mean something (as the string 'add' will
always appear in the output of this file).

llvm-svn: 134358

a file descriptor.

llvm-svn: 134355

desired result based on the comments in the file.

llvm-svn: 134354

llvm-svn: 134353

llvm-svn: 134352

llvm-svn: 134351

llvm-svn: 134350

llvm-svn: 134349

llvm-svn: 134348

llvm-svn: 134346

llvm-svn: 134345

llvm-svn: 134344

llvm-svn: 134343

llvm-svn: 134342

llvm-svn: 134341

llvm-svn: 134340

llvm-svn: 134339

llvm-svn: 134338

llvm-svn: 134337

llvm-svn: 134336

llvm-svn: 134335

llvm-svn: 134334

llvm-svn: 134333

llvm-svn: 134332

llvm-svn: 134331

individual cases, while hard coding less about registers in use.

llvm-svn: 134330

commands as a result.

llvm-svn: 134329

llvm-svn: 134328

llvm-svn: 134324

llvm-svn: 134323

is valid or not depends on which system you build.

llvm-svn: 134321

llvm-svn: 134319

llvm-svn: 134318