Fix simarm64 bugs on Windows.

runtime/vm/assembler_arm64.cc

Index: runtime/vm/assembler_arm64.cc
diff --git a/runtime/vm/assembler_arm64.cc b/runtime/vm/assembler_arm64.cc
index 8f3dc143ccd937f6e374e5ced888693cd646b9c7..1b983876dec7ca5c987130f5e350c77f9e9da2d6 100644
--- a/runtime/vm/assembler_arm64.cc
+++ b/runtime/vm/assembler_arm64.cc
@@ -181,7 +181,7 @@ static int CountLeadingZeros(uint64_t value, int width) {
 
 static int CountOneBits(uint64_t value, int width) {
   // Mask out unused bits to ensure that they are not counted.
-  value &= (0xffffffffffffffffUL >> (64 - width));
+  value &= (0xffffffffffffffffULL >> (64 - width));
 
   value = ((value >> 1) & 0x5555555555555555) + (value & 0x5555555555555555);
   value = ((value >> 2) & 0x3333333333333333) + (value & 0x3333333333333333);
@@ -282,7 +282,7 @@ bool Operand::IsImmLogical(uint64_t value, uint8_t width, Operand* imm_op) {
     // 5. If the most-significant half of the bitwise value is equal to the
     //    least-significant half, return to step 2 using the least-significant
     //    half of the value.
-    uint64_t mask = (1UL << (width >> 1)) - 1;
+    uint64_t mask = (1ULL << (width >> 1)) - 1;
     if ((value & mask) == ((value >> (width >> 1)) & mask)) {
       width >>= 1;
       set_bits >>= 1;