TargetInstrInfo:
Change produceSameValue() to take MachineRegisterInfo as an optional argument.
When in SSA form, targets can use it to make more aggressive equality analysis.

Machine LICM:
1. Eliminate isLoadFromConstantMemory, use MI.isInvariantLoad instead.
2. Fix a bug which prevent CSE of instructions which are not re-materializable.
3. Use improved form of produceSameValue.

ARM:
1. Teach ARM produceSameValue to look pass some PIC labels.
2. Look for operands from different loads of different constant pool entries
   which have same values.
3. Re-implement PIC GA materialization using movw + movt. Combine the pair with
   a "add pc" or "ldr [pc]" to form pseudo instructions. This makes it possible
   to re-materialize the instruction, allow machine LICM to hoist the set of
   instructions out of the loop and make it possible to CSE them. It's a bit
   hacky, but it significantly improve code quality.
4. Some minor bug fixes as well.

With the fixes, using movw + movt to materialize GAs significantly outperform the
load from constantpool method. 186.crafty and 255.vortex improved > 20%, 254.gap
and 176.gcc ~10%.

llvm-svn: 123905

Part of the fix for PR8413.

llvm-svn: 123904

while the inferior is running) to be fast. The previous code would always
cause the sender to timeout, yet still return success due to the way we
were waiting for a value (incorrect value) to change. Now the ProcessGDBRemote
plug-in has a public and private "is running" predicate. This allows things
that need to send async packets to interrupt and wait for the private "is running"
state to be flipped to false, and then resume quickly with no timeout. 

llvm-svn: 123903

llvm-svn: 123902

llvm-svn: 123901

When instantiating member functions, propagate whether the member function is marked 'final' and 'override'.

Also, call CheckOverrideControl when instantiating member functions.

llvm-svn: 123900

llvm-svn: 123899

llvm-svn: 123898

llvm-svn: 123897

llvm-svn: 123896

llvm-svn: 123895

llvm-svn: 123894

llvm-svn: 123893

Added a check for already live regs before claiming HighRegPressure.
Fixed a few cases of checking the wrong number of successors.
Added some tracing until these heuristics are better understood.

llvm-svn: 123892

The live range may have been deleted earlier because of rematerialization.

llvm-svn: 123891

register coalescing.

llvm-svn: 123890

going to actually be used as the symbol file plug-in by looking only for suitable
N_OSO symbols and avoiding sorting function (N_FUN) and global/static (N_GSYM/N_STSYM)
symbols when there are no suitable N_OSO objects.

llvm-svn: 123889

llvm-svn: 123888

llvm-svn: 123887

llvm-svn: 123886

llvm-svn: 123885

with useful instructions.

llvm-svn: 123884

llvm-svn: 123883

llvm-svn: 123882

changes that recently happened.

llvm-svn: 123881

llvm-svn: 123880

llvm-svn: 123879

llvm-svn: 123878

llvm-svn: 123877

llvm-svn: 123876

llvm-svn: 123875

llvm-svn: 123873

llvm-svn: 123872

failed to find a case where an enum context would make a difference, but
found PR9007 on the way.

llvm-svn: 123871

Set the thread state to "bland" before calling functions so they don't 
  inherit the pending signals and die.

llvm-svn: 123869

llvm-svn: 123868

declaration that name lookup actually found, so that we can use it for
access checking later on. Fixes <rdar://problem/8876150>.

llvm-svn: 123867

llvm-svn: 123866

with an invalid type then split the result and perform the overflow check
normally.

Fixes the 32-bit parts of rdar://8622122 and rdar://8774702.

llvm-svn: 123864

so allow it to propagate the failure outward. Fixes the crashing part
of <rdar://problem/8876150>.

llvm-svn: 123863