const-eval: allow calling functions with targat features disabled at compile time in WASM

This is not unsafe on WASM, see rust-lang/rust#84988

Author: eduardosm

ci.sh

@@ -110,8 +110,8 @@ case $HOST_TARGET in
     MIRI_TEST_TARGET=i686-pc-windows-gnu run_tests
     MIRI_TEST_TARGET=x86_64-unknown-freebsd run_tests_minimal hello integer vec panic/panic concurrency/simple atomic data_race env/var
     MIRI_TEST_TARGET=aarch64-linux-android run_tests_minimal hello integer vec panic/panic
-    MIRI_TEST_TARGET=wasm32-wasi run_tests_minimal no_std integer strings
-    MIRI_TEST_TARGET=wasm32-unknown-unknown run_tests_minimal no_std integer strings
+    MIRI_TEST_TARGET=wasm32-wasi run_tests_minimal no_std integer strings wasm
+    MIRI_TEST_TARGET=wasm32-unknown-unknown run_tests_minimal no_std integer strings wasm
     MIRI_TEST_TARGET=thumbv7em-none-eabihf run_tests_minimal no_std # no_std embedded architecture
     MIRI_TEST_TARGET=tests/avr.json MIRI_NO_STD=1 run_tests_minimal no_std # JSON target file
     ;;

tests/pass/function_calls/target_feature_wasm.rs

@@ -0,0 +1,11 @@
+//@only-target-wasm32: tests WASM-specific behavior
+//@compile-flags: -C target-feature=-simd128
+
+fn main() {
+    // Calling functions with `#[target_feature]` is not unsound on WASM, see #84988
+    assert!(!cfg!(target_feature = "simd128"));
+    simd128_fn();
+}
+
+#[target_feature(enable = "simd128")]
+fn simd128_fn() {}