21.05 toolchain C tls variables compilation problem

[Alexander Tormasov]

small c file:

typedef int G;
__thread G *g __asm__("" "runtime.g");
G* runtime_g(void) __attribute__ ((noinline, no_split_stack));
G* runtime_g(void) {  return g; }

during compilation using genode-x86-gcc 10.3 error in asm (and checked genode-x86-as as well):
tt1.s: Assembler messages:
tt1.s:22: Error: junk at end of line, first unrecognized character is `*'
tt1.s:25: Error: unrecognized symbol type ""
tt1.s:25: Error: junk at end of line, first unrecognized character is `*'
tt1.s:26: Error: expected comma after name `__emutls_v.' in .size directive
tt1.s:27: Error: invalid character '*' in mnemonic
tt1.s:13: Error: invalid operands (*UND* and *UND* sections) for `*’

generated asm:
	.file	"tt1.c"
	.text
	.globl	runtime_g
	.type	runtime_g, @function
runtime_g:
.LFB0:
	.cfi_startproc
	pushq	%rbp
	.cfi_def_cfa_offset 16
	.cfi_offset 6, -16
	movq	%rsp, %rbp
	.cfi_def_cfa_register 6
	movl	$__emutls_v.*runtime.g, %edi
	call	__emutls_get_address
	movq	(%rax), %rax
	popq	%rbp
	.cfi_def_cfa 7, 8
	ret
	.cfi_endproc
.LFE0:
	.size	runtime_g, .-runtime_g
	.globl	__emutls_v.*runtime.g
^^^^^^^ first error line ^^^^^^^^^^^^^^^^^
	.data
	.align 32
	.type	__emutls_v.*runtime.g, @object
	.size	__emutls_v.*runtime.g, 32
__emutls_v.*runtime.g:
	.quad	8
	.quad	8
	.quad	0
	.quad	0
	.ident	"GCC: (GNU) 10.3.0"