Update test directives for wasm32-wasip1

* The WASI targets deal with the `main` symbol a bit differently than
  native so some `codegen` and `assembly` tests have been ignored.
* All `ignore-emscripten` directives have been updated to
  `ignore-wasm32` to be more clear that all wasm targets are ignored and
  it's not just Emscripten.
* Most `ignore-wasm32-bare` directives are now gone.
* Some ignore directives for wasm were switched to `needs-unwind`
  instead.
* Many `ignore-wasm32*` directives are removed as the tests work with
  WASI as opposed to `wasm32-unknown-unknown`.

Author: alexcrichton

tests/assembly/wasm_exceptions.rs

@@ -1,4 +1,4 @@
-//@ only-wasm32-bare
+//@ only-wasm32
 //@ assembly-output: emit-asm
 //@ compile-flags: -C target-feature=+exception-handling
 //@ compile-flags: -C panic=unwind

tests/codegen/abi-main-signature-32bit-c-int.rs

@@ -4,6 +4,7 @@
 // This test is for targets with 32bit c_int only.
 //@ ignore-msp430
 //@ ignore-avr
+//@ ignore-wasi wasi codegens the main symbol differently
 
 fn main() {
 }

tests/codegen/drop.rs

@@ -1,4 +1,3 @@
-//@ ignore-wasm32-bare compiled with panic=abort by default
 //@ needs-unwind - this test verifies the amount of drop calls when unwinding is used
 //@ compile-flags: -C no-prepopulate-passes
 

tests/codegen/enum/enum-debug-clike.rs

@@ -3,6 +3,7 @@
 
 //
 //@ ignore-msvc
+//@ ignore-wasi wasi codegens the main symbol differently
 
 //@ compile-flags: -g -C no-prepopulate-passes
 

tests/codegen/enum/enum-debug-niche.rs

@@ -2,6 +2,7 @@
 // This is ignored for the fallback mode on MSVC due to problems with PDB.
 
 //@ ignore-msvc
+//@ ignore-wasi wasi codegens the main symbol differently
 
 //@ compile-flags: -g -C no-prepopulate-passes
 

tests/codegen/enum/enum-debug-tagged.rs

@@ -2,6 +2,7 @@
 // This is ignored for the fallback mode on MSVC due to problems with PDB.
 
 //@ ignore-msvc
+//@ ignore-wasi wasi codegens the main symbol differently
 
 //@ compile-flags: -g -C no-prepopulate-passes
 

tests/codegen/enum/enum-u128.rs

@@ -3,6 +3,7 @@
 
 //
 //@ ignore-msvc
+//@ ignore-wasi wasi codegens the main symbol differently
 
 //@ compile-flags: -g -C no-prepopulate-passes
 

tests/codegen/fn-impl-trait-self.rs

@@ -1,4 +1,5 @@
 //@ compile-flags: -g
+//@ ignore-wasi wasi codegens the main symbol differently
 //
 // CHECK-LABEL: @main
 // MSVC: {{.*}}DIDerivedType(tag: DW_TAG_pointer_type, name: "recursive_type$ (*)()",{{.*}}

tests/codegen/generic-debug.rs

@@ -1,4 +1,5 @@
 //@ ignore-windows
+//@ ignore-wasi wasi codegens the main symbol differently
 
 //@ compile-flags: -g -C no-prepopulate-passes
 

tests/codegen/link_section.rs

@@ -1,4 +1,4 @@
-//@ ignore-emscripten default visibility is hidden
+//@ ignore-wasm32 custom sections work differently on wasm
 //@ compile-flags: -C no-prepopulate-passes
 
 #![crate_type = "lib"]