nvptx: Define valid ASM_OUTPUT_ALIGN.

nvptx: Define valid ASM_OUTPUT_ALIGN.

	gcc/
	* config/nvptx/nvptx.h (ASM_OUTPUT_ALIGN): Define as a C statment.

    gcc/doc/tm.texi:@defmac ASM_OUTPUT_ALIGN (@var{stream}, @var{power})
    gcc/doc/tm.texi-A C statement to output to the stdio stream @var{stream} an assembler
    gcc/doc/tm.texi-command to advance the location counter to a multiple of 2 to the
    gcc/doc/tm.texi-@var{power} bytes.  @var{power} will be a C expression of type @code{int}.
    gcc/doc/tm.texi-@end defmac

    gcc/config/nvptx/nvptx.h:#define ASM_OUTPUT_ALIGN(FILE, POWER)

"Empty" is not a C statement, and so in code such as:

    gcc/dwarf2out.c-              if (lsda_encoding == DW_EH_PE_aligned)
    gcc/dwarf2out.c:                ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (PTR_SIZE));
    gcc/dwarf2out.c-              dw2_asm_output_data (size_of_encoded_value (lsda_encoding), 0,
    gcc/dwarf2out.c-                                   "Language Specific Data Area (none)");

    gcc/varasm.c-      if (align > BITS_PER_UNIT)
    gcc/varasm.c:        ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
    gcc/varasm.c-      assemble_variable_contents (decl, name, dont_output_data);

    gcc/varasm.c-  if (align > 0)
    gcc/varasm.c:    ASM_OUTPUT_ALIGN (asm_out_file, align);
    gcc/varasm.c-
    gcc/varasm.c-  targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);

    gcc/varasm.c-      if (align > BITS_PER_UNIT)
    gcc/varasm.c:        ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
    gcc/varasm.c-      assemble_constant_contents (exp, XSTR (symbol, 0), align);

..., GCC warns:

    [...]/source-gcc/gcc/dwarf2out.c: In function 'void output_fde(dw_fde_ref, bool, bool, char*, int, char*, bool, int)':
    [...]/source-gcc/gcc/dwarf2out.c:665:3: warning: suggest braces around empty body in an 'if' statement [-Wempty-body]
       ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (PTR_SIZE));
       ^

    [...]/source-gcc/gcc/varasm.c: In function 'void assemble_variable(tree, int, int, int)':
    [...]/source-gcc/gcc/varasm.c:2217:2: warning: suggest braces around empty body in an 'if' statement [-Wempty-body]
      ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
      ^
    [...]/source-gcc/gcc/varasm.c: In function 'rtx_def* assemble_trampoline_template()':
    [...]/source-gcc/gcc/varasm.c:2603:5: warning: suggest braces around empty body in an 'if' statement [-Wempty-body]
         ASM_OUTPUT_ALIGN (asm_out_file, align);
         ^
    [...]/source-gcc/gcc/varasm.c: In function 'void output_constant_def_contents(rtx)':
    [...]/source-gcc/gcc/varasm.c:3413:2: warning: suggest braces around empty body in an 'if' statement [-Wempty-body]
      ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
      ^

Also, "use" the values, to get rid of that one:

    [...]/source-gcc/gcc/final.c: In function 'rtx_insn* final_scan_insn(rtx_insn*, FILE*, int, int, int*)':
    [...]/source-gcc/gcc/final.c:2450:12: warning: variable 'log_align' set but not used [-Wunused-but-set-variable]
            int log_align;
                ^

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@218689 138bc75d-0d04-0410-961f-82ee72b054a4