[API compatibility] fix a bug for paddle.where return dtype

[hohdiy]

PR Category

User Experience

PR Types

Bug fixes

Description

问题	详情	处理
没有支持out入参		不单独处理，会统一处理
x或者y为scalar时，类型固定为float64		本次修复
cpu下没有支持float16和bfloat16	测试了paddle在gpu下是能够支持float16和bfloat16，即使对应的gpu不支持bfloat16，也没有报错。	本次不修复，涉及底层kernel注册
x和y类型不同时，支持类型提升	目前只有float类型和complex类型的提升。其他类型和跨类型提升都未实现。	本次不修复

本次修复paddle.where API 在x或者y单独为scalar时，返回的dtype类型不符合预期的问题（应该是float32，而不是float64）。

Pcard-73362

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[jeff41404]

LGTM

[XiaoguangHu01]

LGTM