[M] Change in coreboot[master]: lib/lzma: Build the source for decompression with flag -Ofast

[Bao Zheng (Code Review)]

Attention is currently required from: Martin L Roth, Zheng Bao, Martin Roth, Felix Held.

Hello build bot (Jenkins), Zheng Bao,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/66392

to look at the new patch set (#13).

Change subject: lib/lzma: Build the source for decompression with flag -Ofast
......................................................................

lib/lzma: Build the source for decompression with flag -Ofast

The decompression is critical for speed of boot. So we sacrifice some
generated code size to optimize for speed.

BUG=b:223985641
TEST=Majolica

The output of time stamp for decompression:
  Time Stamp                   Flag:Os         Flag:Ofast
-------------------------------------------------------------
Load FSP-M
  15: starting LZMA decompress 320540 (10)       318991 (10)
  16: finished LZMA decompress 383086 (62546)	 381986 (62995)
Load ramstage
  15: starting LZMA decompress 620311 (5)		 617301 (5)
  16: finished LZMA decompress 640750 (20439)	 639585 (22284)
Load Payload:
  15: starting LZMA decompress 848055 (27)       846713 (26)
  16: finished LZMA decompress 858007 (9952)     857356 (10643)

(Output by "objdump -h ./build/ramstage/lib/lzmadecode.o")
The size of object file with -Os:
  ./build/ramstage/lib/lzmadecode.o:     file format elf32-i386
    4 .text.LzmaDecode 00000d84  00000000  00000000  00000076  2**0
                  CONTENTS, ALLOC, LOAD, READONLY, CODE
The size of object file with -Ofast:
  ./build/ramstage/lib/lzmadecode.o:     file format elf32-i386
    4 .text.LzmaDecode 00001719  00000000  00000000  00000080  2**4
                  CONTENTS, ALLOC, LOAD, READONLY, CODE

Change-Id: Ie003164e2e93ba8ed3ccd207f3af31c6acf1c5e2
Signed-off-by: Zheng Bao 
---
M src/lib/Kconfig
M src/lib/lzmadecode.c
2 files changed, 53 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/92/66392/13