Simplify a few uses of DwarfDebug::SPMap

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219510 91177308-0d34-0410-b5e6-96231b3b80d8
Implement floating point to integer conversion in mips fast-isel

Summary: Add the ability to convert 64 or 32 bit floating point values to integer in mips fast-isel

Test Plan:
fpintconv.ll
ran 4 flavors of test-suite with no errors, misp32 r1/r2 O0/O2

Reviewers: dsanders

Reviewed By: dsanders

Subscribers: llvm-commits, rfuhler, mcrosier

Differential Revision: http://reviews.llvm.org/D5562

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219511 91177308-0d34-0410-b5e6-96231b3b80d8
[MiSched] Fix a logic error in tryPressure()

Fixes a logic error in the MachineScheduler found by Steve Montgomery (and
confirmed by Andy). This has gone unfixed for months because the fix has been
found to introduce some small performance regressions. However, Andy has
recommended that, at this point, we fix this to avoid further dependence on the
incorrect behavior (and then follow-up separately on any regressions), and I
agree.

Fixes PR18883.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219512 91177308-0d34-0410-b5e6-96231b3b80d8