Fix constexpr i128

Author: Julian LALU

interface/core/hash/city_hash.h

@@ -406,7 +406,7 @@ namespace hud::hash_algorithm
         constexpr u64 combine_64(u64 a, u64 b) noexcept
         {
             // From abseil 64 bit hash mix
-            static constexpr u64 kMul = sizeof(size_t) == 4 ? u64 {0xcc9e2d51} : u64 {0x9ddfea08eb382d69};
+            constexpr const u64 kMul = sizeof(usize) == 4 ? u64 {0xcc9e2d51} : u64 {0x9ddfea08eb382d69};
             using MulResultType = hud::conditional_t<sizeof(uptr) == 4, u64, ::u128>;
             // We do the addition in 64-bit space to make sure the 128-bit
             // multiplication is fast. If we were to do it as MultType the compiler has

interface/core/i128/i128_portable.h

@@ -690,7 +690,7 @@ namespace hud
             }
 
             /** Multiply this to other and return this. */
-            u128_portable &operator*=(u128_portable other) noexcept
+            constexpr u128_portable &operator*=(u128_portable other) noexcept
             {
                 *this = *this * other;
                 return *this;
@@ -706,7 +706,7 @@ namespace hud
             }
 
             /** Divide this to other and return this. */
-            u128_portable &operator/=(u128_portable other) noexcept
+            constexpr u128_portable &operator/=(u128_portable other) noexcept
             {
                 *this = *this / other;
                 return *this;
@@ -722,7 +722,7 @@ namespace hud
             }
 
             /** Retrieves the remainder of this divided by other, result in this and returns this. */
-            u128_portable &operator%=(u128_portable other) noexcept
+            constexpr u128_portable &operator%=(u128_portable other) noexcept
             {
                 *this = *this % other;
                 return *this;
@@ -841,7 +841,7 @@ namespace hud
             }
 
             /** Right shift this and return the result */
-            const u128_portable operator>>(i32 amount) const noexcept
+            constexpr const u128_portable operator>>(i32 amount) const noexcept
             {
                 // uint64_t shifts of >= 64 are undefined, so we will need some
                 // special-casing.