ARM64: Fixes and more support for FRINT<X> instructions.

src/arm64/assembler-arm64.cc

Index: src/arm64/assembler-arm64.cc
diff --git a/src/arm64/assembler-arm64.cc b/src/arm64/assembler-arm64.cc
index ad2997c316070600fba82c707a0fd07ab0a162ff..c5280f2aa1b22ba39ecaa11d0bc52c132a767630 100644
--- a/src/arm64/assembler-arm64.cc
+++ b/src/arm64/assembler-arm64.cc
@@ -1660,6 +1660,13 @@ void Assembler::frinta(const FPRegister& fd,
 }
 
 
+void Assembler::frintm(const FPRegister& fd,
+                       const FPRegister& fn) {
+  ASSERT(fd.SizeInBits() == fn.SizeInBits());
+  FPDataProcessing1Source(fd, fn, FRINTM);
+}
+
+
 void Assembler::frintn(const FPRegister& fd,
                        const FPRegister& fn) {
   ASSERT(fd.SizeInBits() == fn.SizeInBits());