Add more PPC floating-point conversion instructions

The P7 and A2 have additional floating-point conversion instructions which
allow a direct two-instruction sequence (plus load/store) to convert from all
combinations (signed/unsigned i32/i64) <--> (float/double) (on previous cores,
only some combinations were directly available).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178480 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCSubtarget.h b/lib/Target/PowerPC/PPCSubtarget.h
index 3958bc9..d5dfa1e 100644
--- a/lib/Target/PowerPC/PPCSubtarget.h
+++ b/lib/Target/PowerPC/PPCSubtarget.h
@@ -80,6 +80,7 @@
   bool HasSTFIWX;
   bool HasLFIWAX;
   bool HasFPRND;
+  bool HasFPCVT;
   bool HasISEL;
   bool HasPOPCNTD;
   bool HasLDBRX;
@@ -161,6 +162,7 @@
   bool hasSTFIWX() const { return HasSTFIWX; }
   bool hasLFIWAX() const { return HasLFIWAX; }
   bool hasFPRND() const { return HasFPRND; }
+  bool hasFPCVT() const { return HasFPCVT; }
   bool hasAltivec() const { return HasAltivec; }
   bool hasQPX() const { return HasQPX; }
   bool hasMFOCRF() const { return HasMFOCRF; }