vim-patch:9.1.0919: filetype: some assembler files are not recognized

Problem:  filetype: some assembler are files not recognized
Solution: detect '*.nasm' files as nasm filetype and '*.masm' as masm
          filetype (Wu, Zhenyu)

closes: vim/vim#16194

d66d68763d

Co-authored-by: Wu, Zhenyu <wuzhenyu@ustc.edu>

runtime/doc/syntax.txt

@@ -414,12 +414,15 @@ There are many types of assembly languages that all use the same file name
 extensions.  Therefore you will have to select the type yourself, or add a
 line in the assembly file that Vim will recognize.  Currently these syntax
 files are included:
-	asm		GNU assembly (the default)
+	asm		GNU assembly (usually have .s or .S extension and were
+			already built using C compiler such as GCC or CLANG)
 	asm68k		Motorola 680x0 assembly
 	asmh8300	Hitachi H-8300 version of GNU assembly
 	ia64		Intel Itanium 64
 	fasm		Flat assembly (https://flatassembler.net)
-	masm		Microsoft assembly (probably works for any 80x86)
+	masm		Microsoft assembly (.masm files are compiled with
+			Microsoft's Macro Assembler. This is only supported
+			for x86, x86_64, ARM and AARCH64 CPU families)
 	nasm		Netwide assembly
 	tasm		Turbo Assembly (with opcodes 80x86 up to Pentium, and
 			MMX)

runtime/lua/vim/filetype.lua

@@ -743,6 +743,7 @@ local extension = {
   mkd = detect.markdown,
   markdown = detect.markdown,
   mdown = detect.markdown,
+  masm = 'masm',
   mhtml = 'mason',
   mason = 'mason',
   master = 'master',
@@ -805,6 +806,7 @@ local extension = {
   n1ql = 'n1ql',
   nql = 'n1ql',
   nanorc = 'nanorc',
+  nasm = 'nasm',
   NSA = 'natural',
   NSC = 'natural',
   NSG = 'natural',