[AArch64] Fix Test&Branch to relative location instructions.

Wasn't masking by the size of the offset encoding so negative values were killing the instruction
Missed commiting this in my integer gatherpipe PR.
Fixes crashing on AArch64.

Source/Core/Common/Arm64Emitter.cpp

@@ -477,7 +477,7 @@ void ARM64XEmitter::EncodeTestBranchInst(u32 op, ARM64Reg Rt, u8 bits, const voi
 
 	Rt = DecodeReg(Rt);
 	Write32((b64Bit << 31) | (0x36 << 24) | (op << 24) | \
-	        (bits << 19) | (distance << 5) | Rt);
+	        (bits << 19) | (((u32)distance << 5) & 0x7FFE0) | Rt);
 }
 
 void ARM64XEmitter::EncodeUnconditionalBranchInst(u32 op, const void* ptr)