[llvm] [llvm-objcopy] Support SREC output format (PR #75874)

[via llvm-commits]

================
@@ -324,6 +324,14 @@ Expected<IHexRecord> IHexRecord::parse(StringRef Line) {
   return Rec;
 }
 
+static uint64_t sectionLMA(const SectionBase *Sec) {
----------------
quic-areg wrote:

I see different results from gnu objcopy when using sectionPhysicalAddr. 

example using `ihex-elf-segments.yaml`:

GNU:
```
S00400007883
S214000000000102030405060708090A0B0C0D0E0F73
S20900001010111213148C
S20F00FFF83031323334353637383940AC
S20801010040414243EF
S20F10FFF850515253545556575859603C
S20720FFF8000000E1
S804100000EB

address data 

000000 000102030405060708090A0B0C0D0E0F
000010 1011121314
00FFF8 3031323334353637383940
010100 40414243
10FFF8 5051525354555657585960
20FFF8 000000
```

LLVM(sectionPhysicalAddr):
```
S00400007883
S214100000000102030405060708090A0B0C0D0E0F63
S20910001010111213147C
S20F10001830313233343536373839407B
S20810002840414243B9
S20F100030505152535455565758596003
S20720FFF8000000E1
S804100000EB

address data 

100000 000102030405060708090A0B0C0D0E0F
100010 1011121314
100018 3031323334353637383940
100028 40414243
100030 5051525354555657585960
20FFF8 000000
```

looking at the LMA values in objdump -h output, I think that the former is correct
```
objdump -h 1.o 

1.o:     file format elf64-x86-64

Sections:
Idx Name          Size      VMA               LMA               File off  Algn
  0 .text         00000015  0000000000000000  0000000000000000  00000078  2**3
  1 .data1        0000000b  000000000000fff8  000000000000fff8  00000090  2**3
  2 .data2        00000004  0000000000010100  0000000000010100  000000a0  2**3
  3 .data3        0000000b  000000000010fff8  000000000010fff8  000000a8  2**3
```

https://github.com/llvm/llvm-project/pull/75874