Add code snippets for Backwards Writing in Compose

[riggaroo]

No description provided.

[snippet-bot]

Here is the summary of changes.

You are about to add 8 region tags.

• compose/snippets/src/main/java/com/example/compose/snippets/performance/BackwardsWriteSnippets.kt:42, tag android_compose_performance_backwards_write_read_comp_write_layout
• compose/snippets/src/main/java/com/example/compose/snippets/performance/BackwardsWriteSnippets.kt:43, tag android_compose_performance_backwards_write_layout_bad
• compose/snippets/src/main/java/com/example/compose/snippets/performance/BackwardsWriteSnippets.kt:67, tag android_compose_performance_backwards_write_layout_good
• compose/snippets/src/main/java/com/example/compose/snippets/performance/BackwardsWriteSnippets.kt:94, tag android_compose_performance_backwards_write_layout_subcomposition
• compose/snippets/src/main/java/com/example/compose/snippets/performance/BackwardsWriteSnippets.kt:106, tag android_compose_performance_backwards_write_read_comp_write_draw
• compose/snippets/src/main/java/com/example/compose/snippets/performance/BackwardsWriteSnippets.kt:123, tag android_compose_performance_backwards_write_read_comp_write_comp
• compose/snippets/src/main/java/com/example/compose/snippets/performance/BackwardsWriteSnippets.kt:124, tag android_compose_performance_backwards_write_bad_counter
• compose/snippets/src/main/java/com/example/compose/snippets/performance/BackwardsWriteSnippets.kt:136, tag android_compose_performance_backwards_write_ok_counter

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