Importing rustc-1.49.0

Bug: 176888219
Change-Id: Ib0805d37e7b485cd420bbff8a8b000cf87e7ede0

compiler/rustc_codegen_llvm/src/va_arg.rs

diff --git a/compiler/rustc_codegen_llvm/src/va_arg.rs b/compiler/rustc_codegen_llvm/src/va_arg.rs
index 22ed4dd..3fc56ee 100644
--- a/compiler/rustc_codegen_llvm/src/va_arg.rs
+++ b/compiler/rustc_codegen_llvm/src/va_arg.rs
@@ -52,7 +52,7 @@
     let next = bx.inbounds_gep(addr, &[full_direct_size]);
     bx.store(next, va_list_addr, bx.tcx().data_layout.pointer_align.abi);
 
-    if size.bytes() < slot_size.bytes() && &*bx.tcx().sess.target.target.target_endian == "big" {
+    if size.bytes() < slot_size.bytes() && &*bx.tcx().sess.target.endian == "big" {
         let adjusted_size = bx.cx().const_i32((slot_size.bytes() - size.bytes()) as i32);
         let adjusted = bx.inbounds_gep(addr, &[adjusted_size]);
         (bx.bitcast(adjusted, bx.cx().type_ptr_to(llty)), addr_align)
@@ -105,7 +105,7 @@
     let mut end = bx.build_sibling_block("va_arg.end");
     let zero = bx.const_i32(0);
     let offset_align = Align::from_bytes(4).unwrap();
-    assert!(&*bx.tcx().sess.target.target.target_endian == "little");
+    assert!(&*bx.tcx().sess.target.endian == "little");
 
     let gr_type = target_ty.is_any_ptr() || target_ty.is_integral();
     let (reg_off, reg_top_index, slot_size) = if gr_type {
@@ -171,28 +171,26 @@
 ) -> &'ll Value {
     // Determine the va_arg implementation to use. The LLVM va_arg instruction
     // is lacking in some instances, so we should only use it as a fallback.
-    let target = &bx.cx.tcx.sess.target.target;
-    let arch = &bx.cx.tcx.sess.target.target.arch;
-    match (&**arch, target.options.is_like_windows) {
+    let target = &bx.cx.tcx.sess.target;
+    let arch = &bx.cx.tcx.sess.target.arch;
+    match &**arch {
         // Windows x86
-        ("x86", true) => {
+        "x86" if target.is_like_windows => {
             emit_ptr_va_arg(bx, addr, target_ty, false, Align::from_bytes(4).unwrap(), false)
         }
         // Generic x86
-        ("x86", _) => {
-            emit_ptr_va_arg(bx, addr, target_ty, false, Align::from_bytes(4).unwrap(), true)
-        }
+        "x86" => emit_ptr_va_arg(bx, addr, target_ty, false, Align::from_bytes(4).unwrap(), true),
         // Windows AArch64
-        ("aarch64", true) => {
+        "aarch64" if target.is_like_windows => {
             emit_ptr_va_arg(bx, addr, target_ty, false, Align::from_bytes(8).unwrap(), false)
         }
-        // iOS AArch64
-        ("aarch64", _) if target.target_os == "ios" => {
+        // macOS / iOS AArch64
+        "aarch64" if target.is_like_osx => {
             emit_ptr_va_arg(bx, addr, target_ty, false, Align::from_bytes(8).unwrap(), true)
         }
-        ("aarch64", _) => emit_aapcs_va_arg(bx, addr, target_ty),
+        "aarch64" => emit_aapcs_va_arg(bx, addr, target_ty),
         // Windows x86_64
-        ("x86_64", true) => {
+        "x86_64" if target.is_like_windows => {
             let target_ty_size = bx.cx.size_of(target_ty).bytes();
             let indirect: bool = target_ty_size > 8 || !target_ty_size.is_power_of_two();
             emit_ptr_va_arg(bx, addr, target_ty, indirect, Align::from_bytes(8).unwrap(), false)