Fix PPC64 Float16 support

Author: colemancda

package/swift/swift.mk

@@ -48,6 +48,9 @@ SWIFTC_EXTRA_FLAGS		= -Xcc -msoft-float
 else ifeq ($(SWIFT_TARGET_ARCH),powerpc)
 SWIFT_EXTRA_FLAGS		= -mcpu=7400
 SWIFTC_EXTRA_FLAGS		= -Xcc -mcpu=7400
+else ifeq ($(SWIFT_TARGET_ARCH),powerpc64le)
+SWIFT_EXTRA_FLAGS		= -DSWIFT_DTOA_PASS_FLOAT16_AS_FLOAT=1
+SWIFTC_EXTRA_FLAGS		= -Xcc -DSWIFT_DTOA_PASS_FLOAT16_AS_FLOAT=1
 else
 SWIFT_EXTRA_FLAGS		= 
 SWIFTC_EXTRA_FLAGS		=