[WIP] Fix __*tf2 signatures

FIXME should match https://github.com/rust-lang/compiler-builtins/blob/8aba4c899ee89eef7fe688cdfa6629ddd56908f9/compiler-builtins/src/float/cmp.rs#L7-L21

Author: bjorn3

src/codegen_f16_f128.rs

@@ -73,7 +73,7 @@ pub(crate) fn fcmp(fx: &mut FunctionCx<'_, '_, '_>, cc: FloatCC, lhs: Value, rhs
                 // FIXME(rust-lang/compiler-builtins#919): This should be `I64` on non-AArch64
                 // architectures, but switching it before compiler-builtins is fixed causes test
                 // failures.
-                vec![AbiParam::new(types::I32)],
+                vec![AbiParam::new(types::I64)],
                 &[lhs, rhs],
             )[0];
             let zero = fx.bcx.ins().iconst(types::I32, 0);

src/compiler_builtins.rs

@@ -87,12 +87,12 @@ builtin_functions! {
     fn fmod(a: f64, b: f64) -> f64;
     fn fmodf128(a: f128, b: f128) -> f128;
     // float comparison
-    fn __eqtf2(a: f128, b: f128) -> i32;
-    fn __netf2(a: f128, b: f128) -> i32;
-    fn __lttf2(a: f128, b: f128) -> i32;
-    fn __letf2(a: f128, b: f128) -> i32;
-    fn __gttf2(a: f128, b: f128) -> i32;
-    fn __getf2(a: f128, b: f128) -> i32;
+    fn __eqtf2(a: f128, b: f128) -> i64;
+    fn __netf2(a: f128, b: f128) -> i64;
+    fn __lttf2(a: f128, b: f128) -> i64;
+    fn __letf2(a: f128, b: f128) -> i64;
+    fn __gttf2(a: f128, b: f128) -> i64;
+    fn __getf2(a: f128, b: f128) -> i64;
     fn fminimumf128(a: f128, b: f128) -> f128;
     fn fmaximumf128(a: f128, b: f128) -> f128;
     // Cranelift float libcalls