Webassemly asm text parser/generator doesn't handle custom data section.

[Quuxplusone]

Bugzilla Link	PR46023
Status	NEW
Importance	P enhancement
Reported by	Sam Clegg (sbc@chromium.org)
Reported on	2020-05-21 12:04:09 -0700
Last modified on	2020-05-21 12:51:13 -0700
Version	trunk
Hardware	PC Linux
CC	aardappel@gmail.com, dschuff@google.com, llvm-bugs@lists.llvm.org
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Currently I can write the following llvm code and it will generate a working working object file:

@foo = global i32 42, section "mysection", align 4

However if I output to assembly I get:

$ llc --mtriple=wasm32 --asm-verbose=false test.ll -o -

.type foo,@object
  .section  mysection,"aw",@
  .globl  foo
  .p2align 2
foo:
  .int32  42
  .size foo, 4

Which the assembly reader rejects:

$ llvm-mc -triple=wasm32-unknown-unknown test.s
test.s:2:23: error: unknown section kind: mysection
  .section  mysection,"",@

[Quuxplusone]

I guess we need to somehow mark the section as data in the .s we output (we could add the .data prefix maybe?).

We we have to have some heuristic about detecting the sections types when reading .s input.