Do not emit debug info by default

This basically flips the --noDebug flag to become a --debug flag, so some optimizations, like inlining, aren't skipped by default, which might be unexpected.

tests/compiler/call-inferred.optimized.wat

@@ -1,73 +1,12 @@
 (module
- (type $iiiiv (func (param i32 i32 i32 i32)))
  (type $v (func))
- (type $FUNCSIG$i (func (result i32)))
- (type $FUNCSIG$d (func (result f64)))
- (type $FUNCSIG$f (func (result f32)))
- (import "env" "abort" (func $~lib/env/abort (param i32 i32 i32 i32)))
  (memory $0 1)
  (data (i32.const 8) "\10\00\00\00c\00a\00l\00l\00-\00i\00n\00f\00e\00r\00r\00e\00d\00.\00t\00s")
  (table $0 1 anyfunc)
- (elem (i32.const 0) $null)
+ (elem (i32.const 0) $start)
  (export "memory" (memory $0))
  (export "table" (table $0))
- (start $start)
- (func $call-inferred/foo<i32> (; 1 ;) (type $FUNCSIG$i) (result i32)
-  i32.const 42
- )
- (func $call-inferred/foo<f64> (; 2 ;) (type $FUNCSIG$d) (result f64)
-  f64.const 42
- )
- (func $call-inferred/foo<f32> (; 3 ;) (type $FUNCSIG$f) (result f32)
-  f32.const 42
- )
- (func $start (; 4 ;) (type $v)
-  call $call-inferred/foo<i32>
-  i32.const 42
-  i32.ne
-  if
-   i32.const 0
-   i32.const 8
-   i32.const 5
-   i32.const 0
-   call $~lib/env/abort
-   unreachable
-  end
-  call $call-inferred/foo<f64>
-  f64.const 42
-  f64.ne
-  if
-   i32.const 0
-   i32.const 8
-   i32.const 6
-   i32.const 0
-   call $~lib/env/abort
-   unreachable
-  end
-  call $call-inferred/foo<f32>
-  f32.const 42
-  f32.ne
-  if
-   i32.const 0
-   i32.const 8
-   i32.const 7
-   i32.const 0
-   call $~lib/env/abort
-   unreachable
-  end
-  call $call-inferred/foo<f32>
-  f32.const 42
-  f32.ne
-  if
-   i32.const 0
-   i32.const 8
-   i32.const 13
-   i32.const 0
-   call $~lib/env/abort
-   unreachable
-  end
- )
- (func $null (; 5 ;) (type $v)
+ (func $start (; 0 ;) (type $v)
   nop
  )
 )