llvm: fix @wasmMemory{Size,Grow} for wasm64

Closes #19942

src/Air.zig

@@ -782,13 +782,13 @@ pub const Inst = struct {
         field_parent_ptr,
 
         /// Implements @wasmMemorySize builtin.
-        /// Result type is always `u32`,
+        /// Result type is always `usize`,
         /// Uses the `pl_op` field, payload represents the index of the target memory.
         /// The operand is unused and always set to `Ref.none`.
         wasm_memory_size,
 
         /// Implements @wasmMemoryGrow builtin.
-        /// Result type is always `i32`,
+        /// Result type is always `isize`,
         /// Uses the `pl_op` field, payload represents the index of the target memory.
         wasm_memory_grow,
 
@@ -1471,8 +1471,8 @@ pub fn typeOfIndex(air: *const Air, inst: Air.Inst.Index, ip: *const InternPool)
         .save_err_return_trace_index,
         => return Type.usize,
 
-        .wasm_memory_grow => return Type.i32,
-        .wasm_memory_size => return Type.u32,
+        .wasm_memory_grow => return Type.isize,
+        .wasm_memory_size => return Type.usize,
 
         .int_from_bool => return Type.u1,
 

src/Sema.zig

@@ -26253,7 +26253,7 @@ fn zirWasmMemoryGrow(
     const index: u32 = @intCast(try sema.resolveInt(block, index_src, extra.lhs, Type.u32, .{
         .needed_comptime_reason = "wasm memory size index must be comptime-known",
     }));
-    const delta = try sema.coerce(block, Type.u32, try sema.resolveInst(extra.rhs), delta_src);
+    const delta = try sema.coerce(block, Type.usize, try sema.resolveInst(extra.rhs), delta_src);
 
     try sema.requireRuntimeBlock(block, builtin_src, null);
     return block.addInst(.{

src/codegen/llvm.zig

@@ -7625,7 +7625,8 @@ pub const FuncGen = struct {
         const o = self.dg.object;
         const pl_op = self.air.instructions.items(.data)[@intFromEnum(inst)].pl_op;
         const index = pl_op.payload;
-        return self.wip.callIntrinsic(.normal, .none, .@"wasm.memory.size", &.{.i32}, &.{
+        const llvm_usize = try o.lowerType(Type.usize);
+        return self.wip.callIntrinsic(.normal, .none, .@"wasm.memory.size", &.{llvm_usize}, &.{
             try o.builder.intValue(.i32, index),
         }, "");
     }
@@ -7634,7 +7635,8 @@ pub const FuncGen = struct {
         const o = self.dg.object;
         const pl_op = self.air.instructions.items(.data)[@intFromEnum(inst)].pl_op;
         const index = pl_op.payload;
-        return self.wip.callIntrinsic(.normal, .none, .@"wasm.memory.grow", &.{.i32}, &.{
+        const llvm_isize = try o.lowerType(Type.isize);
+        return self.wip.callIntrinsic(.normal, .none, .@"wasm.memory.grow", &.{llvm_isize}, &.{
             try o.builder.intValue(.i32, index), try self.resolveInst(pl_op.operand),
         }, "");
     }