Add support for LoongArch (#19223)

* Add support for LoongArch

* Update compiler/installer.ini

Co-authored-by: Andreas Rumpf <rumpf_a@web.de>

tools/nim.zsh-completion

@@ -95,6 +95,7 @@ _nim() {
     '*--cpu=sparc64[compile for SPARC64 architecture]' \
     '*--cpu=vm[compile for Nim VM]' \
     '*--cpu=wasm32[compile to WASM 32]' \
+    '*--cpu=loongarch64[compile for LoongArch64 architecture]' \
     '*--gc=refc[use reference counting garbage collection]' \
     '*--gc=arc[use ARC garbage collection]' \
     '*--gc=orc[use ORC garbage collection]' \

tools/niminst/buildsh.nimf

@@ -229,6 +229,8 @@ case $ucpu in
     mycpu="riscv64" ;;
   *e2k* )
     mycpu="e2k" ;;
+  *loongarch64* )
+    mycpu="loongarch64" ;;
   *)
     echo 2>&1 "Error: unknown processor: $ucpu"
     exit 1

tools/niminst/makefile.nimf

@@ -169,6 +169,9 @@ endif
 ifeq ($(ucpu),e2k)
   mycpu = e2k
 endif
+ifeq ($(ucpu),loongarch64)
+  mycpu = loongarch64
+endif
 ifndef mycpu
   $(error unknown CPU architecture: $(ucpu) See makefile.nimf)
 endif