Do less inlining in lazy initializer expressions.

Do less inlining in lazy initializer expressions.

Lazy initializer expressions are executed at most once, so should be optimized for size rather than speed.
This currently means only inlining when the call is the only use of the function, sunce we don't really have the right information to do a good job in other cases.

Also use this heuristic to inline in throw expressions - this eliminates the constructor function for several exception classes that have a single throw site.

R=floitsch@google.com

Committed: https://code.google.com/p/dart/source/detail?r=42420

[sra1, 2014-12-16 23:40:48]

sra@google.com changed reviewers:
+ floitsch@google.com

[sra1, 2014-12-16 23:40:49]

This helps by about 1% on an app that uses protocol buffers as the descriptors
are defined as static field members.

Examples:

Isolate.$lazy($, "KEYWORDS", "KEYWORDS", "get$KEYWORDS", function() {
  var t1 = P.LinkedHashSet_LinkedHashSet(null, null, null, P.String);
  t1.addAll$1(0, ["null", "undefined", "true", "false"]);
  return t1;
});
--->
Isolate.$lazy($, "KEYWORDS", "KEYWORDS", "get$KEYWORDS", function() {
  return P.LinkedHashSet_LinkedHashSet$from(["null", "undefined", "true",
"false"], P.String);
});

Isolate.$lazy($, "_START_TAG_REGEXP", "SvgElement__START_TAG_REGEXP",
"get$SvgElement__START_TAG_REGEXP", function() {
  return new H.JSSyntaxRegExp("<(\\w+)", H.JSSyntaxRegExp_makeNative("<(\\w+)",
false, true, false), null, null);
});
--->
Isolate.$lazy($, "_START_TAG_REGEXP", "SvgElement__START_TAG_REGEXP",
"get$SvgElement__START_TAG_REGEXP", function() {
  return P.RegExp_RegExp("<(\\w+)", true, false);
});

[floitsch, 2014-12-17 00:17:28]

LGTM!

[sra1, 2014-12-17 01:49:34]

Committed patchset #2 (id:20001) manually as 42420 (presubmit successful).