Legalize: implement scalarization of overflow intrinsics

test/cases/safety/memmove_len_mismatch.zig

@@ -15,5 +15,5 @@ pub fn main() !void {
     return error.TestFailed;
 }
 // run
-// backend=llvm
+// backend=stage2,llvm
 // target=native

test/cases/safety/slice_cast_change_len_0.zig

@@ -23,4 +23,5 @@ pub fn panic(message: []const u8, _: ?*std.builtin.StackTrace, _: ?usize) noretu
 const std = @import("std");
 
 // run
-// backend=llvm
+// backend=stage2,llvm
+// target=x86_64-linux

test/cases/safety/slice_cast_change_len_1.zig

@@ -23,4 +23,5 @@ pub fn panic(message: []const u8, _: ?*std.builtin.StackTrace, _: ?usize) noretu
 const std = @import("std");
 
 // run
-// backend=llvm
+// backend=stage2,llvm
+// target=x86_64-linux

test/cases/safety/slice_cast_change_len_2.zig

@@ -23,4 +23,5 @@ pub fn panic(message: []const u8, _: ?*std.builtin.StackTrace, _: ?usize) noretu
 const std = @import("std");
 
 // run
-// backend=llvm
+// backend=stage2,llvm
+// target=x86_64-linux

test/cases/safety/truncating vector cast.zig

@@ -17,5 +17,5 @@ pub fn main() !void {
 }
 
 // run
-// backend=llvm
+// backend=stage2,llvm
 // target=native

test/cases/safety/unsigned-signed vector cast.zig

@@ -17,5 +17,5 @@ pub fn main() !void {
 }
 
 // run
-// backend=llvm
+// backend=stage2,llvm
 // target=native

test/cases/safety/vector integer addition overflow.zig

@@ -18,5 +18,5 @@ fn add(a: @Vector(4, i32), b: @Vector(4, i32)) @Vector(4, i32) {
     return a + b;
 }
 // run
-// backend=llvm
+// backend=stage2,llvm
 // target=native

test/cases/safety/vector integer multiplication overflow.zig

@@ -18,5 +18,5 @@ fn mul(a: @Vector(4, u8), b: @Vector(4, u8)) @Vector(4, u8) {
     return a * b;
 }
 // run
-// backend=llvm
+// backend=stage2,llvm
 // target=native

test/cases/safety/vector integer negation overflow.zig

@@ -18,5 +18,5 @@ fn neg(a: @Vector(4, i16)) @Vector(4, i16) {
     return -a;
 }
 // run
-// backend=llvm
+// backend=stage2,llvm
 // target=native

test/cases/safety/vector integer subtraction overflow.zig

@@ -18,5 +18,5 @@ fn sub(a: @Vector(4, u32), b: @Vector(4, u32)) @Vector(4, u32) {
     return a - b;
 }
 // run
-// backend=llvm
+// backend=stage2,llvm
 // target=native