Disable new intrinsics for bootstrap

Author: calebzulawski

Diff for: library/core/src/intrinsics/simd.rs

@@ -257,6 +257,7 @@ extern "platform-intrinsic" {
     /// type).
     ///
     /// `mask` must only contain `0` or `!0` values.
+    #[cfg(not(bootstrap))]
     pub fn simd_masked_load<V, U, T>(mask: V, ptr: U, val: T) -> T;
 
     /// Write to a vector of pointers.
@@ -276,6 +277,7 @@ extern "platform-intrinsic" {
     /// type).
     ///
     /// `mask` must only contain `0` or `!0` values.
+    #[cfg(not(bootstrap))]
     pub fn simd_masked_store<V, U, T>(mask: V, ptr: U, val: T);
 
     /// Add two simd vectors elementwise, with saturation.