exp/template: simplify method and function calls by using the value's Method rather than the type's, so a method's invocation works the same as a function's.
exp/template: simplify method and function calls by using the value's Method
rather than the type's, so a method's invocation works the same as a function's.

R=golang-dev, rsc, r
CC=golang-dev
http://codereview.appspot.com/4704049

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