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Previously our --help messages were always simply hard-coded text
blocks. This makes it easy for them to get out-of-sync with the actual
flags the programs take. To fix this teach the cmdline system how to
generate these types of help text.
Convert over `dalvikvm` which is one of the worst when it comes to
usefulness of the -help text.
```
% dalvikvm -help
dalvikvm: [options] class [argument ...]
The following standard arguments are supported:
-classpath {string value}
-cp {string value}
The classpath, separated by ':'
-D{string value} [-D{string value}...]
-verbose:{class|collector|compiler|deopt|gc|heap|interpreter|jdwp|jit|jni|monitor|oat|profiler|signals|simulator|startup|third-party-jni|threads|verifier|verifier-debug|image|systrace-locks|plugin|agents|dex}
Switches for advanced logging. Multiple categories can be enabled separated by ','. Eg: -verbose:class,deopt
-help
-h
Print this help text.
-showversion
-agentpath:{/path/to/libagent.so=options} [-agentpath:{/path/to/libagent.so=options}...]
Load native agents.
The following extended arguments are supported:
-Xbootclasspath:{list separated by ':'}
-Xcheck:jni
-Xms{Memory with granularity of 1024 bytes}
-Xmx{Memory with granularity of 1024 bytes}
-Xss{Memory with granularity of 1 bytes}
-Xint
The following Dalvik arguments are supported:
-Xzygote
Start as zygote
-Xjnitrace:{string value}
...
```
Test: dalvikvm -help
Bug: 160933150
Change-Id: Id96bc8340b799636d322450cb95c88f814a77c35
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