gcc: (loongarch64) improve architecture support

- Add D support.
- Change target cpu la464 => loongarch64 to ensure consistency with our
  default Autobuild3 flags (generic LoongArch64).
- (upstream patches) Fix LTO on loongarch64.

Co-Authored-By: Mingcong Bai <[email protected]>
Co-Authored-By: Jiangjin Wang <[email protected]>

core-devel/gcc/01-runtime/defines

@@ -83,8 +83,8 @@ AUTOTOOLS_AFTER__ARMV7HF="$AUTOTOOLS_AFTER $AUTOTOOLS_AFTER__RETRO \
                         --with-arch=armv7-a --with-float=hard --with-fpu=neon"
 AUTOTOOLS_AFTER__I486="$AUTOTOOLS_AFTER $AUTOTOOLS_AFTER__RETRO \
                         --with-cpu=i486 --with-tune=bonnell"
-AUTOTOOLS_AFTER__LOONGARCH64="$AUTOTOOLS_AFTER ${AUTOTOOLS_AFTER__NOGO/,d,ada/} \
-                        --with-abi=lp64d --with-arch=la464 --with-tune=la464"
+AUTOTOOLS_AFTER__LOONGARCH64="$AUTOTOOLS_AFTER ${AUTOTOOLS_AFTER__NOGO/,ada/} \
+                        --with-abi=lp64d --with-arch=loongarch64 --with-tune=la464"
 AUTOTOOLS_AFTER__LOONGSON2F="$AUTOTOOLS_AFTER $AUTOTOOLS_AFTER__RETRO \
                         --with-abi=64 --with-arch=mips3 \
                         --with-tune=loongson2f"
@@ -116,6 +116,19 @@ AUTOTOOLS_AFTER__RISCV64="$AUTOTOOLS_AFTER $AUTOTOOLS_AFTER__GO \
 
 ABMK="profiledbootstrap"
 ABMK__LOONGSON3="bootstrap"
+# FIXME: ICE during compilation with profiling.
+#
+# during RTL pass: cse1
+# .../gcc-13.2.0/libgcc/libgcc2.c: In function ‘__cmpti2’:
+# .../gcc-13.2.0/libgcc/libgcc2.c:1309:1: internal compiler error: in mode_size_inline, at ./insn-modes-inline.h:18
+# 1309 | }
+#      | ^
+# during RTL pass: cse1
+# .../gcc-13.2.0/libgcc/libgcc2.c: In function ‘__ashlti3’:
+#.../gcc-13.2.0/libgcc/libgcc2.c:435:1: internal compiler error: in mode_size_inline, at ./insn-modes-inline.h:18
+#  435 | }
+#      | ^
+ABMK__LOONGARCH64="bootstrap"
 AB_FLAGS_SPECS=0
 AB_FLAGS_O3=1