Rename memory instructions; Rework constant handling (#177)

* Rename memory instructions as proposed by the bulk-memory-operations spec.
* Rename memory manager functions to memory.* as well
* Remove automatic inlining of constant globals (Binaryen does this now)
* Improve 'const' enum compatibility
* Improve module-level export generation
* Enable the inline decorator for constant variables
* Add ERROR, WARNING and INFO macros that emit a user-defined diagnostic
* Reintroduce builtin decorator so these can appear anywhere in stdlib again
* Inline isNaN and isFinite by default
* Make an interface around gc.* similar to memory.*
* Emit an error when trying to inline a mutable variable
* Slim down CI stages
* Add a more convenient tracing utility for debugging
* Implement some prequesites for an eventual bundled GC

std/assembly/internal/array.ts

@@ -36,8 +36,8 @@ export function weakHeapSort<T>(arr: Array<T>, comparator: (a: T, b: T) => i32):
 
   var length = arr.length;
   var bitsetSize = (length + 31) >> 5 << shift32;
-  var bitset = allocate_memory(bitsetSize); // indexed in 32-bit chunks below
-  set_memory(bitset, 0, bitsetSize);
+  var bitset = memory.allocate(bitsetSize); // indexed in 32-bit chunks below
+  memory.fill(bitset, 0, bitsetSize);
 
   // see: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.21.1863&rep=rep1&type=pdf
 
@@ -83,7 +83,7 @@ export function weakHeapSort<T>(arr: Array<T>, comparator: (a: T, b: T) => i32):
     }
   }
 
-  free_memory(bitset);
+  memory.free(bitset);
 
   var t = loadUnsafe<T,T>(buffer, 1);                         // t = arr[1]
   storeUnsafe<T,T>(buffer, 1, loadUnsafe<T,T>(buffer, 0));    // arr[1] = arr[0]