PPC64: [turbofan] Changed TruncateFloat64ToInt64 to TryTruncateFloat64ToInt64.

src/ppc/assembler-ppc.cc

Index: src/ppc/assembler-ppc.cc
diff --git a/src/ppc/assembler-ppc.cc b/src/ppc/assembler-ppc.cc
index b4e29ae753e2c940527db6be0a24787ad9eaeced..147fb59aaea0a9387bc1d371a411a21f8a593261 100644
--- a/src/ppc/assembler-ppc.cc
+++ b/src/ppc/assembler-ppc.cc
@@ -1844,7 +1844,10 @@ void Assembler::mtxer(Register src) {
 }
 
 
-void Assembler::mcrfs(int bf, int bfa) {
+void Assembler::mcrfs(CRegister cr, FPSCRBit bit) {
+  DCHECK(static_cast<int>(bit) < 32);
+  int bf = cr.code();
+  int bfa = bit / CRWIDTH;
   emit(EXT4 | MCRFS | bf * B23 | bfa * B18);
 }
 
@@ -2219,6 +2222,20 @@ void Assembler::fneg(const DoubleRegister frt, const DoubleRegister frb,
 }
 
 
+void Assembler::mtfsb0(FPSCRBit bit, RCBit rc) {
+  DCHECK(static_cast<int>(bit) < 32);
+  int bt = bit;
+  emit(EXT4 | MTFSB0 | bt * B21 | rc);
+}
+
+
+void Assembler::mtfsb1(FPSCRBit bit, RCBit rc) {
+  DCHECK(static_cast<int>(bit) < 32);
+  int bt = bit;
+  emit(EXT4 | MTFSB1 | bt * B21 | rc);
+}
+
+
 void Assembler::mtfsfi(int bf, int immediate, RCBit rc) {
   emit(EXT4 | MTFSFI | bf * B23 | immediate * B12 | rc);
 }